How long in your opinion will I need my braces on for? (Photo)

I just got braces put on yesterday, they hurt of course but they're ceramic so they look nice and aren't that noticeable. I was just curious to you opinion how long you would think I need braces for? My ortho says I had good teeth size, color, and hygiene wise so overcrowding and alignment are my only issue. Although I have acid stains and a yellow tint excuse them. :) thank you! I also feel as though they look more crooked with braces on.